<template>
  <a-collapse
    expandIconPosition="right"
    :bordered="false"
  >
    <a-collapse-panel header="变量池(todo)" key="2">
      <a-icon type="plus" slot="extra"></a-icon>
      <a-table :columns="columns" :data-source="data" bordered>
        <template
          v-for="col in ['name', 'address']"
          :slot="col"
          slot-scope="text, record, index"
        >
          <div :key="col">
            <a-input
              v-if="record.editable"
              style="margin: -5px 0"
              :value="text"
              @change="e => handleChange(e.target.value, record.key, col)"
            />
            <template v-else>
              {{ text }}
            </template>
          </div>
        </template>
        <template slot="operation" slot-scope="text, record, index">
          <div class="editable-row-operations">
            <span v-if="record.editable">
              <a @click="() => save(record.key)">Save</a>
              <a-popconfirm title="Sure to cancel?" @confirm="() => cancel(record.key)">
                <a>Cancel</a>
              </a-popconfirm>
            </span>
            <span v-else>
              <a :disabled="editingKey !== ''" @click="() => edit(record.key)">Edit</a>
            </span>
          </div>
        </template>
      </a-table>
    </a-collapse-panel>
  </a-collapse>
</template>
<script>
const columns = [
  {
    title: 'name',
    dataIndex: 'name',
    width: '25%',
    scopedSlots: { customRender: 'name' }
  },
  {
    title: 'age',
    dataIndex: 'age',
    width: '15%',
    scopedSlots: { customRender: 'age' }
  },
  {
    title: 'operation',
    dataIndex: 'operation',
    scopedSlots: { customRender: 'operation' }
  }
]

const data = []
for (let i = 0; i < 100; i++) {
  data.push({
    key: i.toString(),
    name: `Edrward ${i}`,
    age: 32,
    address: `London Park no. ${i}`
  })
}
export default {
  data () {
    this.cacheData = data.map(item => ({ ...item }))
    return {
      data,
      columns,
      editingKey: ''
    }
  },
  methods: {
    handleChange (value, key, column) {
      const newData = [...this.data]
      const target = newData.filter(item => key === item.key)[0]
      if (target) {
        target[column] = value
        this.data = newData
      }
    },
    edit (key) {
      const newData = [...this.data]
      const target = newData.filter(item => key === item.key)[0]
      this.editingKey = key
      if (target) {
        target.editable = true
        this.data = newData
      }
    },
    save (key) {
      const newData = [...this.data]
      const newCacheData = [...this.cacheData]
      const target = newData.filter(item => key === item.key)[0]
      const targetCache = newCacheData.filter(item => key === item.key)[0]
      if (target && targetCache) {
        delete target.editable
        this.data = newData
        Object.assign(targetCache, target)
        this.cacheData = newCacheData
      }
      this.editingKey = ''
    },
    cancel (key) {
      const newData = [...this.data]
      const target = newData.filter(item => key === item.key)[0]
      this.editingKey = ''
      if (target) {
        Object.assign(target, this.cacheData.filter(item => key === item.key)[0])
        delete target.editable
        this.data = newData
      }
    }
  }
}
</script>
<style scoped>
.editable-row-operations a {
  margin-right: 8px;
}
</style>
